Reviews by patients who have Tooth Pain and take Zinc either as part of daily diet or as method of treatment. Positive and negative experiences from patients with Tooth Pain that take Zinc
1 Red or black colored stool may be a sign of bleeding in the GI tract (from the esophagus, stomach, small intestine or colon) and should not be ignored.  When stool color changes, what tests need to be done depend upon depends upon what cause is suspected for the stool color change.
Medications or Substances causing Black stool. Medications or substances causing Black stool. The following drugs, medications, substances or toxins are some of the possible causes of Black stool as a symptom. This list is incomplete and various other drugs or substances may cause your symptoms (see Black stool).